Hello, I'm DVdm. I noticed that you made a change to an article, Fine-structure constant, but you didn't provide a source. I’ve removed it for now, but if you’d like to include a citation to a reliable source and re-add it, please do so! If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks, DVdm (talk) 22:10, 18 January 2013 (UTC)

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